Attachment for grinding machines



Sept. 17, 19446. w, KEEMA 2,407,835

ATTACHMENT FOR GRINDING MACHINES Filed April '4, 1944 2 Sheets-Sheet 1INVENTOR B, a1 pflmw v ATTORNEYS Sept. 17, 1946.

A. w. EEMA 2,407,835

ATTACHMENT FOR GRINDING MACHINES Filed April 4, 1944 2 Sheets-Sheet 2MI" I INVENTOR fifexawa er W/lee/Wa ATTORNEYS Patented Sept. 17, 1946ATTACHMENT FOR GRINDING MACHINES Alexander W. Keema, Providence, R. I.,Vassignor,

by mesne assignments, to Bay Products Corporation, a corporation ofMassachusetts ApplicationApril 4, 1944, Serial No. 529,493

This invention relates to an attachment for a. grinding machine, moreparticularly a surface grinder.

Attachments for grinding machines usually position the grinding tool ina plane some distance removed from the plane of the grinding wheel whichis driven direct from the spindle when the attachment is not in use.Consequently, the full width of the table upon which the work is mountedis not available for use with the attachment.

, One of the objects of this attachment is to provide an attachmentmounting which will enable the tool of the attachment to be placednearer to the plane of the grinding tool which is utilized on thegrindingmachine proper or in the plane where a greater amount of area ofthe table may be utilized for the work.

Another object of this invention is the provision of an adapter wherebythe supporting bracket for the attachment may be arranged to embrace thespindle housing and be positioned inwardly from the end of the spindle.

Another object of this invention is to arrange a driving pulley to belocated in substantially the same plane as that occupied by the maingrinding wheel which would be mounted upon the spindle of the grindingmachine.

With these and other objects in view, the invention consists of certainnovel features of construction, as will be more fully described andparticularly pointed out in the appended claims.

In the accompanying drawings:

' Fig. l is a side elevation of a fragmental portion of the spindle andhousing illustrating my attachment in place thereon;

Fig. 2 is an end view of the same;

Fig. 3 is an exploded view showing the various parts, some of which arein section, of the spindle, housing and the attachment which ispositioned thereon;

Fig. 4 is a sectional view of the attachment, spindle and housing suchas shown in Fig. 1; and

Fig. 5 is a sectional view taken on substantially line 55 of Fig. 4.

In proceeding with this invention the various parts of the attachmenthave been reformed and reassembled so that the driving pulley which isutilized is mounted directly on the end of the spindle with its drivingsurface arranged so as to be inwardly from the end of the spindle uponwhich it is mounted. To accomplish thi an adapter is provided which ismounted on the spindle housing and arranged with a supporting bracketfor the attachment tool shaft at a posi- 10 Claims. (Cl. 51,1.66)

tion inwardly from the adapter and inwardly from the end of the spindle.Thus, everything is built inwardly from the end of the spindle in steadof outwardly from the end of the spindle whereby the driving belt may bepositioned in a plane to utilize a greater amount of table area than hasheretofore been provided with attachment for grinding machinery of thecharacter here dealt with.

With reference to the drawings, I0 designates the spindle of a grindingmachine which projects through a sleeve housing ll whichis a part of thecasing or framework of the machine. A conical portion 12 projects beyondthe cylindri-cal end l3 of the spindle and has a mounting member l4positioned thereon by means of the nut l5. This mounting member isutilized for the positioning of a grinding wheel on the spindle whendesired. a

The attachment parts which are provided consist of an adapter memberdesignated generally It, a bracket designated generally ll, a tool shafthousing unit designated generally l8, and a u1. ley designated generally19, all of which are shown in exploded relation in Fig. 3.

The adapter designated generally it. is generally annular in shape,having a, body portion 2a with acentral opening 2| therein ofsubstantially the diameter of the spindle [3. This body portion issecured by means of screws or bolts 23 to the spindle housing I I whichis provided with threaded openings 24 to receive three or more screws23passing through the body and entering this spindle housing. This adapterhas a rear.- Wardly extending flange 24 projecting over the housing IIwith a wide face 25 and outwardly extending lugs or ears 2.6 which arethreaded as at 21 for the mounting of the bracket ll thereon.

The bracket ll has a generally annular body H portion 39 stiffened by arib 3| extending radially outwardly therefrom with a central opening 32.

which is of a size to permit this bracket to. be loosely positioned overthe housing H so as to encircle or embrace the same. This bracket ispositioned about the spindle housing prior to the bolting of the adapterE6 in position. After the adapter is in position as above described thebracket is secured to the adapter by means of bolts 33 which extendthroughthe lugs or out wardly extending cars 34 on either side of thebracket which are so located as to register with the lugs or ears 2% ofthe adapter. The lugs or cars 34 of the bracket are slotted as at 35 soas.

to accommodate the supporting bracket in vari-v cus positions withreference to the adapter, the

bracket being bound in place by the bolt 33 in a desired position ofadjustment. At the lower portion of the bracket l1 mounting foot 36 isprovided having threaded openings therein 31 to Whichthe casing 38 ofthe unit I 8 is attached by means of bolt 39 extending through the ears40 which are on either side of this unit I8. In this unit l8 there islocated a shaft designated 4| upon the end of which a tool 42 is mountedfor operation on the work. A pulley or belt engaging surface 43 isprovided on this shaft so that the same may be driven.

The pulley 43 is driven by the pulley H! which consists of a bodyportion 45 having an opening 46 therein to receive the member M and beheld securely on the member l4 by means of the nut 4! engaging thethreaded portion 48 of this member thereby holding the s'amefirmly onthe spindle so as to be driven thereby. The body 45 is arched inwardlyso as to provide the pulley cup shaped. The edge portion of the pulleyis provided with spaced flanges 49 and 50 providing a belt drivingsurface 5| directly over and in the same plane with the pulley 43 sothat a belt .52 may embrace the pulley 45 and the pulley 43 V therinwardly from the end of the spindle than has heretofore been possible.Also by providing a pulley which is of generally cup shape so that itsdriving surface will be substantially over the adapter the plane of thedrive of the belt is located a substantial distance inwardly from theend of the spindle. Further, by making the shaft 4| short where itextends outward beyond the casing l8 and driving this shaft close to thegrinding tool a greater portion of the table upon which the work isusually mounted maybe utilized than has heretofore been possible.

I claim:

1. In an attachment for a grinding machine an adapter member to besecured to the spindle housing, a bracket secured to said adapter toembrace the spindle housing inwardly from the outer extremity of thespindle, said member and bracket having the same center, a tool shaftrotatably carried by said bracket, a pulley carried by said tool shaftand positioned at a location substantially inwardly of the outer edge ofsaid adapter member.

2. In combination with a grinding machine spindle and housing therefor,an adapter member secured to the spindle housing, a bracket secured tosaid adapter to embrace the spindle housing inwardly from the outerextremity of the spindle, said member and bracket having portionsconcentric with said spindle, a tool shaft rotatably carried by saidbracket, a pulley carried by said from the outer extremity of thespindle, a tool shaft rotatably carried by said bracket, a pulleycarried by said tool shaft and positioned at a location substantiallyinwardly of the outer extremity of the spindle, a pulley secured to saidspindle cupped to extend over said adapter member and. a belt embracingsaid pulleys whereby said spindle drives said tool shaft.

4. In combination with a grinding machine spindle and housing therefor,a grinding attachment wholly supported by said spindle and housingcomprising an adapter member secured to the spindle housing, a bracketsecured to said adapter to embrace the spindle housing inwardly from theouter extremity of the spindle, said member and bracket having portionsconcentric with said spindle, a tool shaft rotatably carried by saidbracket, a pulley carried by said tool shaft and positioned at alocation substantially inwardly of the outer extremity of thespindle, apulley secured to said spindle having abelt engaging surface in linewith said pulley on said tool shaft and a belt embracing said pulleys.

5. In combination with a grinding machine spindle and housing therefor,an auxiliarygrind ing attachment wholly suspended from said house ingcomprising an adapter member secured to the outer edge of said housingand having a portion thereof positioned at a location substantiallyinwardly of the outer extremity of saidhousing, a bracket secured to thesaid portion of the adapter extending inwardly of the housing, a-toolshaft rotatably carried by said bracket, a pulley on said shaft andpositioned in a plane passing laterally through said adaptersubstantially inwardly of the outer edge thereof, a pulley on saidspindle, and a belt embracing said pulleys whereby said spindle drivessaid tool shaft. V

6. In an attachment for a grinding machine an adapter member to besecured to the spindle housing at the outer edge thereof and cupped toextend over said housing, a bracket secured to said adapter to embracethe spindle housing inwardly from the outer extremity of the spindle, atool shaft rotatably carried by said bracket, a pulley carried by saidtool shaft and positioned at a location substantially inwardly of theouter edge of said adapter member.

7. In combination with a grinding machine spindle and housing therefor,an adapter member secured to the spindle housing at the outer edgethereof and cupped to extend over saidhousing, a bracket secured to saidadapter at the inner edge thereof so as to embrace the spindle housinginwardly from the outer extremity of the spindle, a tool shaft rotatablycarried by said bracket, a pulley carried by said tool shaft andpositioned at a location substantially inwardly of the outer edge ofsaid adapter member, a pulley secured to said spindle at the outer endextremity there of, and a belt embracin said pulleys whereby saidspindle drives said tool shaft. y

8. In combination witha machine spindle and housing therefor, a grindingattachment wholly supported by said spindle and housing comprising anadapter member securedto the spindle housing, a bracket secured tosaidadapter to embrace the spindle housing inwardly from the outer extremityof the spindle, a tool shaft ro-- tatably carried by said bracket, apulley carried, by said tool shaft and positioned at a locationsubstantially inwardly of the outer extremity of the spindle, a pulleysecured to said spindle at the outer end extreme portion thereof andcupped to extend over said adapter'member and a belt embracing saidpulleys whereby said spindle drives said tool shaft.

9. In combination with a grinding machine spindle and housing therefor,a grinding attachment Wholly supported by said spindle and housingcomprising an adapter member secured to the spindle housing, a bracketsecured to said adapter to embrace the spindle housinginwardly from theouter extremity of the spindle, a tool shaft rotatably carried by saidbracket, a pulley carried by said tool shaft and positioned at alocation substantially inwardly of the outer extremity of the spindle, apulley secured to said spindle at the outer end extremity thereof andhaving a belt engaging surface in the line with said pulley on said toolshaft and a belt embracing said pulleys.

10. In combination with a grinding machine spindle and housing therefor,said spindle having the extremeend portion thereof formed to receive anabrasive Wheel thereon, an auxiliary grinding attachment whollysuspended from said housing comprising an adapter member secured to theouter edge of said housing and having a portion thereof positioned at alocation substantially inwardly of the outer extremity of said housing,a bracket secured to the said portion of the adapter extending inwardlyof the housing, a tool shaft rotatably carried by said bracket, a pulleyon said shaft and positioned in a plane passing laterally through saidadapter substantially inwardly of the outer edge thereof, a pulley onsaid spindle secured to the said extreme end portion thereof, and a beltembracing said pulleys whereby said spindle drives said tool shaft.

ALEXANDER W. KEEMA.

